function isAudit(user) {
    return user.age >= 18;
}
var john = {
    name: 'john',
    age: 18
};
// const lucy: User = {
//   name: 'lucy',
//   age: 'unknow'
// }
var bo = isAudit(john);
console.log("bo ==> ", bo);
// const isLucyAnAdult: string = isAudit(lucy, 'xxxx')
